Download Solving for Y…

Name: _____________________________
Solving for Y
Name
Unit 7: Writing Equations of Lines
Let’s Unwrap
a Present!!
Form
Example
Slope Intercept
Standard
1) 2x – 3y = 21
2) 2x – 4y = 40
3) 6x + 2y = 12
4) 3x + 4y = 8
5) x + 2y = 8
6) -6x + y = 18
Name: _____________________________
More Solving for Y Practice
1) 5y = 15 + 3x
2) 8x – 3y = 18
3) -7x – 2y = 18
4) -5x – 9y = 36
5) x + 4y = -32
6) 3x = 12 + y
Name: _____________________________
Unit 7: Writing Equations of Lines
Solving for Y Notes
Notes to refresh your memory on how to graph a line!
To graph a line we put the equation in the form of Y = mx + b
- m stands for _______________
- b stands for ________________
- Step 1. ________________________________
- Step 2.________________________________
- In slope, the top number is how much you
move ____________, the bottom number is
how much you move to the _____________.
- If the slope is a whole number _________________
________________.
- Example y = 4x + 2  y = ____x + 2
Graph: y = ½ x – 3
Solving for Y…
When you want to graph a line in ____________________ form
(ex._______________) all you need to do is convert it into
_________________ form (ex. ______________).
• REMEMBER THAT YOU ARE JUST “Un-wrapping” the equation to
reveal the _____________ and ______________.
• Once you have these two things you have enough
information to __________ the line!!!
•
Example Problems:
1.
2x + 4y = 16
Solve each equation for y, and then graph each line below
2.
-3x + 4y = 4
3.
25x + 5y = 25
4.
4x – 16y = 48
5.
-6x + 2y = 10
6.
7.
4x + 12y = -24
6x + 3y = -9
Homework
Tuesday
Directions: Write a short note to your partner(s) sharing how you will contribute
to the 2013 Algebra Dream Team. Explain what you bring to the team and what
you need from them.
Dear Teammate(s) __________________________________,
I ____________________ math class, and I am _____________ that we
(how does this class make you feel)
(how do you feel about having a team)
are now a team. I think that a good team ______________________________
__________________________________________________________. I also
(what a good team should do)
Think that a good team does not _____________________________________
_______________________________________________________________
(what a good team does not do)
As my team, I may need you to help me with ___________________________
___________________________________________________.
(what do you need help with in this class)
I find _______________________________________________
(what is hard about this class)
hard about math class. My goal for this class is to have _______ as my grade
(your goal)
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
_____________________________________________________
(write 2 more sentences to your partner)
Thank you,
Homework
Wednesday
Show all work and complete all problems to receive credit.
Remember what a perfect graph is!
1. Graph a line with a slope of 3 and a yintercept of -3
2. Solve for y: 2x + 3y = 15
3. Graph the line y = -1/3x + 4
4. Solve the equation below for x
3x + 2xy – 7 = 2(xy – 2)
Homework
Solve each equation for y to determine which is
the correctly matched graph. MUST SHOW ALL
WORK TO RECEIVE CREDIT! Fill in answer below
1. 2x + 6y = 6
Thursday
A
B
2.
3x + 4y = -8
3.
3x – 2y = 0
4.
6x – 3y = -12
1.
2.
C
D
3.
4.
Fly Ahead
1. Solve for x. x² + x + 3 = 2x + 6 + x²
2. Solve for x. -x + 4 – xy = -3x + 8 - xy
3.
4. The sides of a square are 3x – 3.
Express the perimeter in terms of x.
Find the rate of change
of the following table:
X
Y
-6
3
-2
4
2
5
5. Use the graphs below to answer questions 1 – 6